Andrew Charlwood
100 lines
3.4 KiB
SQL
100 lines
3.4 KiB
SQL
/*
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Prescribing spend by patient template
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=====================================
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Purpose:
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Rank patients by estimated prescribing cost over a selected period and
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medicine definition.
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Use this when looking for high-cost patients or checking the shape of cost
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concentration before doing deeper clinical review.
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Default source is the maintained unified prescribing table, which already
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includes parsed quantity and estimated price. If that table is unavailable
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or needs rebuilding, see 06_advanced_methods/product_price_and_quantity_parsing_template.sql.
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Keep at least one medicine filter set. Leaving BNF, VTM, and VMP filters all
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NULL can scan all prescribing and is usually not a useful starting point.
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*/
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SET START_DATE = '2025-04-01';
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SET END_DATE = '2026-03-31';
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SET BNF_PREFIX = '0403';
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SET VTM_SNOMED_CODE = NULL;
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SET VMP_SNOMED_CODE = NULL;
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SET TOP_N = 100;
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WITH products AS (
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-- Keep at least one of the filters below populated so the product set is intentional.
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SELECT DISTINCT
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"ProductSnomedCode",
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"ProductDescription",
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"TherapeuticMoietyName",
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"BNFCode",
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"BNFParagraphCode"
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FROM DATA_HUB.DWH."DimMedicineAndDevice"
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WHERE ($BNF_PREFIX IS NOT NULL AND "BNFCode" LIKE $BNF_PREFIX || '%')
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OR ($VTM_SNOMED_CODE IS NOT NULL AND "TherapeuticMoietySnomedCode" = $VTM_SNOMED_CODE)
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OR ($VMP_SNOMED_CODE IS NOT NULL AND "MedicinalLatestSnomedCode" = $VMP_SNOMED_CODE)
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),
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patient_costs AS (
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-- Aggregate first at patient/practice level so ranking is not inflated by joins.
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SELECT
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rx."PersonKey",
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rx."CurrentGeneralPractice" AS "PracticeCode",
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COUNT(*) AS "PrescriptionRows",
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COUNT(DISTINCT prod."ProductSnomedCode") AS "DistinctProducts",
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SUM(COALESCE(rx."EstPrice", 0)) AS "EstimatedCost"
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FROM REPORTING_DATASETS_ICB.SCRATCHPAD."MEDS__UnifiedPrescribingTable" rx
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INNER JOIN products prod
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ON rx."SNOMEDCode" = prod."ProductSnomedCode"
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WHERE rx."DateMedicationStart" BETWEEN $START_DATE AND $END_DATE
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AND rx."PersonKey" IS NOT NULL
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GROUP BY rx."PersonKey", rx."CurrentGeneralPractice"
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),
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practice_lookup AS (
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-- De-duplicated practice labels prevent site-level duplicates in the ranking output.
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SELECT
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"OrganisationCode" AS "PracticeCode",
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MIN("OrganisationName") AS "PracticeName",
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MIN("PCNName") AS "PCNName",
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MIN("PlaceName") AS "PlaceName",
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MIN("AllianceName") AS "AllianceName"
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FROM DATA_HUB.DWH."DimOrganisationAndSite"
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WHERE "OrganisationSubType" = 'GP Practice'
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AND "IsSiteActive" = 'Yes'
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AND "IsSiteNorfolkAndSuffolk" = 'Yes'
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AND "SiteCode" = "OrganisationCode"
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GROUP BY "OrganisationCode"
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),
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ranked AS (
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SELECT
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ROW_NUMBER() OVER (ORDER BY pc."EstimatedCost" DESC NULLS LAST) AS "Rank",
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gp."PracticeName",
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gp."PCNName",
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gp."PlaceName",
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gp."AllianceName",
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pc."PersonKey",
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pc."PracticeCode",
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pc."PrescriptionRows",
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pc."DistinctProducts",
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pc."EstimatedCost"
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FROM patient_costs pc
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INNER JOIN practice_lookup gp
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ON pc."PracticeCode" = gp."PracticeCode"
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)
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SELECT
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"Rank",
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"PracticeName",
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"PCNName",
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"PlaceName",
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"AllianceName",
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"PersonKey",
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"PracticeCode",
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"PrescriptionRows",
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"DistinctProducts",
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"EstimatedCost"
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FROM ranked
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WHERE "Rank" <= $TOP_N
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ORDER BY "Rank";
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